/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsExp/Public/OffsetMeshTool.h
Optional base mesh boundary loops. Default enabled. These are computed at Tool startup if required, and then not modified, so can be passed to multithreaded operators/etc If this function returns true, InitialBoundaryLoops will be initialized in ToolSetup(). This has some cost and should be disabled if not necessary.
virtual bool RequiresInitialBoundaryLoops() const